wireshark's pretty good http://www.wireshark.org/
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What is in an NNTP packet
We have been looking at some traces and we are seeing allot of NNTP packets. I realize that it network news transport protocol but could something else be hiding in it? It comprises more than a third of the traffic.
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by: Ignition_HelpdeskPosted on 2009-10-19 at 11:13:18ID: 25607590
if it comprises that much traffic you should put a sniffer on your network and trace the source and destination IP. I'd say you have someone on your network using a work computer to download from newsgroups (torrents, movies, games, etc...)